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+\# ROM Selection and Configuration Guide
+
+
+
+> \[English](ROM.md) | \[Русский](ROM.ru.md)
+
+
+
+The "Leningrad-2 2025 Revision" PCB provides flexible options for installing ROM chips. You can use standard vintage EPROMs or modern alternatives depending on your goals.
+
+
+
+\## Supported ROM Chips
+
+
+
+1\. \*\*Standard 48K Setup:\*\*
+
+   \* \*\*2764 (К573РФ4/6)\*\* — Requires two separate chips. One holds the lower part of the ROM (Basic-48), and the other holds the upper part.
+
+   \* \*\*27128 (К573РФ8)\*\* — A single chip that holds the entire 16 KB ZX Spectrum 48K ROM.
+
+
+
+2\. \*\*Expanded Setup (with TR-DOS / BDI):\*\*
+
+   \* \*\*27256\*\* — Allows you to store two different versions of TR-DOS or customized firmware.
+
+   \* \*\*W27E256\*\* — A modern, electrically erasable (EEPROM) drop-in replacement for the 27256. Highly recommended for easy flashing.
+
+
+
+\---
+
+
+
+\## Jumper Settings for ROM
+
+
+
+\* \*\*JP4 (ROM Type Selection):\*\* 
+
+  \* \*\*Short\*\* this jumper if you are installing \*\*two 2764\*\* chips.
+
+  \* \*\*Leave Open\*\* if you are using a single \*\*27128\*\* or \*\*27256\*\* chip.
+
+\* \*\*J12 (TR-DOS Firmware Selection):\*\* 
+
+  \* Active only when using a \*\*27256\*\* ROM. It switches between the two firmware banks stored on the chip.
+
+\* \*\*JP5–JP9 (Memory Expansion Support):\*\* 
+
+  \* Must be soldered/shorted to ensure correct address lines routing for future memory expansions and multi-bank ROM configurations.
+
+
+
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+# Video Configuration & RGB2VGA Setup
+
+> [English](VGA.md) | [Русский](VGA.ru.md)
+
+The Leningrad-2 2025 Revision features an integrated onboard **ZX_RGBI2VGA-HDMI** converter designed by AlexEkb. This converter uses a powerful Raspberry Pi **RP2040-Zero** board to upscale the vintage ZX Spectrum video signal to modern displays.
+
+## Selecting Output: VGA vs. HDMI
+
+The board can output video via either a standard VGA connector or an HDMI port.
+
+### 1. HDMI Mode (Recommended)
+* **Jumpers JP1, JP2, JP3:** Must be left **OPEN**.
+* **Resistors R24 to R31:** You **MUST** replace the standard resistors with **270 Ohm** values to ensure proper signal voltage levels for HDMI stability.
+
+### 2. VGA Mode
+* **Jumpers JP1, JP2, JP3:** Must be **SHORTED**.
+* Use standard resistor values as specified in the original schematic.
+
+---
+
+## Flashing the RP2040-Zero Firmware
+
+To flash or update the video converter firmware via the onboard USB port, follow these crucial safety steps:
+
+1. **Disconnect System Power:** Turn off the main power supply of the Leningrad-2 computer.
+2. **Open Jumper J9:** Open/remove the **J9** jumper. *Crucial:* This completely isolates the RP2040-Zero power lines from the main computer board, preventing back-powering issues and potential hardware damage during flashing.
+3. **Connect USB:** Connect a USB-C cable from your PC to the RP2040-Zero.
+4. **Flash:** Hold the `BOOT` button on the RP2040-Zero, plug it in, and drop the `.uf2` firmware file onto the mounted drive.
+5. **Restore:** Unplug the USB cable, **close/solder J9** back, and power on the computer.